Achievement Roadmap

This is a suggested Achievement Roadmap. You are free to replay this game as many times as you require.

Handle Clean Hands by itself, unless you feel like using a Save History as your extra "weapon" to save and reload all your failures at being seen or spotted (for Ghost and Faceless).

For Clean Hands, the Combat Sleep Dart is a very handy purchase, since that is Corvo's only non-lethal ranged attack.

For Ghost and Faceless, you cannot be spotted at all (the Metal Gear Solid Stealth Syndrome). Killing enemies is an option, so you may find the occasional stealth kill using a crossbow very helpful. This naturally, will disqualify you from Clean Hands.

Beware that in the mission Flooded District, Corvo will need to make a mandatory decision between two NPCs. One choice will always brand you as a killer, but incur no alerts; the second choice easily results in no fatalities, but it may be extremely difficult (if not impossible) to evade detection (unless you use Bend Time at maximum level at the right moment). Alternately, you can risk shooting the NPC with a Sleep Dart (resulting in a massive swarm of rats) but that will immediately disable the NPC and prevent it from respawning a version that can detect you.

There is no difficulty requirement for any achievement. You may accomplish them all on any difficulty setting you choose (and you may change the setting at any time).

A note on Easy Difficulty -- Corvo does not need to be in "sneak mode" to choke or stealth kill enemies on Easy (he can be standing up; as long as the NPC is not aware of him, he can initiate either action).

You may find Easy difficulty the fastest / easiest way to do Clean Hands and Shadow / Ghost especially once you upgrade Corvo's boots to have maximum stealth. Once you do, you can literally sprint up to unaware targets and take them down.